A chemical cross-linking method for the analysis of binding partners of heat shock protein-90 in intact cells.
A chemical cross-linking method for the analysis of binding partners of heat shock protein-90 in intact cells.
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DOI:
10.2144/000113856
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发表时间:
2012-04
期刊:
影响因子:
2.7
通讯作者:
Bernier M
中科院分区:
文献类型:
--
作者:
Song S;Kole S;Bernier M
Members of the heat shock protein-90 (Hsp90) family are key regulators of biological processes through dynamic interaction with a multitude of protein partners. However, the transient nature of these interactions hinders the identification of Hsp90 interactors. We show that chemical crosslinking with ethylene glycolbis(succinimidylsuccinate), but not shorter crosslinkers, generated an abundant 240-kDa heteroconjugate of the molecular chaperone Hsp90 in different cell types. The combined use of pharmacological and genetic approaches allowed the characterization of the subunit composition and subcellular compartmentalization of the multimeric protein complex, termed p240. The in situ formation of p240 did not require the N-terminal domain or the ATPase activity of Hsp90. Utilizing subcellular fractionation techniques and a cell-impermeant crosslinker, subpopulations of p240 were found to be present in both the plasma membrane and the mitochondria. The Hsp90-interacting proteins, including Hsp70, p60Hop and the scaffolding protein filamin A, had no role in governing the formation of p240. Therefore, chemical crosskinking combined with proteomic methods has the potential to unravel the protein components of this p240 complex and, more importantly, may provide an approach to expand the range of tools available to the study of the Hsp90 interactome.
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DOI:
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